Topic: Recharable 9 volts in a MMA6000

[JD]

I finally got around to running some tests with rechargeable 9V.
First, I grabbed two no-name ones from Ebay, both DOA. Seller was cool and refunded all money.
Next I got the following:

http://thomasdistributing.com/shop/-maha-powerex-96-volt-230mah-nimh-rechargeable-batterybr1-battery-pack-p-505.html?SP_id=&osCsid=32ce0a978f4ff378c90e3e457d13c6df

and

http://thomasdistributing.com/shop/-maha-powerex-mhc490f-9-volt-9v-battery-chargerbr4channel-smart-battery-chargerbrus-110v-adapter-included-p-436.html?SP_id=&osCsid=32ce0a978f4ff378c90e3e457d13c6df




Here are the results of my battery testing:

Battery test for Powerex NiMH 9.6 volt, 230 mah battery in the MMA6000

Test equipment: DPA4060 > DPAMMA6000 > R09



Test Notes:

--Recorded ambient sound, MMA6000 set to 20db gain.
--Batteries were new and conditioned by charging them fully then,
  completely discharging them 5 times before testing.
--Charger used -Powerex MH-C490F
--Batteries were left to charge for approximately 1 hour after
  the Charger's LEDs went from red to green.
--The charger took about three hours to go from red to green when
  the batteries where fully discharged. So figure on a three to four hour
  charge time if they are completely dead.


I ran two different tests one time with each battery then averaged the results

Test A -- Recorded about 4 hours at a time then paused between a couple of hours
              to a day between recording sessions.

          Results--Average total run time = 18.5 Hours
                       (Red LED was on for about the last 1 1/2 Hours)

Test B -- Recorded nonstop till battery died.
         
          Results--Average total run-time = 16 Hours
                      (Red LED was on for about the last 1 1/2 Hours)

No noticeable loss in sound quality while the red LED was on.

I am quite impressed with the time, almost as good as DPA reports for Alkaline batteries.

One note of importance, after charging the batteries, I measured them at about 11VDC!!!
After about an hour or two that would drop to about 10.5VDC. A new Alkaline is usually about
9.3 to 9.6VDC.

I also ran these in my Sonosax SX-M2 and got about 2 1/2 hours before they dropped to the point where
the pre started to distort. 4 of these would cover most two set shows comfortably.

[JD]

Figured I post a little follow up about the Powerex 9.6 (230)volt batteries.

I have been running these in my MMA6000 for about 5 months, with no problems. I would run them about four hours each time then recharge them. This worked fine until last Saturday, when about 2 hours into a show, on a fresh charge, the battery died.

Went home and tried the second battery out in the pre. Died in about the same time frame.
Every previous test I did with these batteries with that pre gave me at least 16 hours run time.

I've since charged and tested both batteries several times and they both are consistently running the pre 18+ hours.

So what I'm guessing is that the batteries where getting a memory from the small discharge cycle and completely draining them refreshed them? Any thoughts on this?




 

[mozmoz8]

There is a new 300mAh battery out. It's the highest capacity I've seen.

http://www.thomasdistributingshop.com/MAHA-9V-300-mAh-NiMH-Rechargeable-Battery_p_188-230.html?lt_c=shopping

Anyone used these before?

[gmm6797]

Isnt that still 200mAh below a standard 9v battery off the shelf @ WalMart?

[esteyes]

check this link out
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2373

i've had excellent luck with their products

neil

[gmm6797]

Lithiuim batteries, nice... a little pricey for start up costs but thats OK... anyone want to buy me some to test with LOL

But note this from the specs:
Please note this battery size is a bit larger than standard 9v NiMh rechargeable battery. Please check dimension below

[gmm6797]

Lithium                                 nimh 250 mah
Max Dimension(mm)
Thickness:  17.8mm (0.7")       16mm                    +1.8mm
Width:        26.8mm (1.05")     26mm                    +0.8mm
Height:       49.2mm (1.94")     48mm                    +1.2mm

[gmm6797]

Also out of stock

[morst]

There is a new 300mAh battery out. It's the highest capacity I've seen.

http://www.thomasdistributingshop.com/MAHA-9V-300-mAh-NiMH-Rechargeable-Battery_p_188-230.html?lt_c=shopping

Anyone used these before?

Bump for (untested?) 325 mAH 9volt cell
Thomas Distrubuting

(note, I have been using Walgreens Alkalines for about 8 years and not personally gotten a bad one yet. Knock On Wood. I heard years ago that they were manufactured by Duracell, but don't know if it is still, or for that matter, was ever the case)